机构地区: 广西大学林学院
出 处: 《中国森林病虫》 2009年第3期21-23,共3页
摘 要: 小袋蛾Acanthopsyche suberalbataHampson是红树林的主要害虫之一,为了研究该虫在白骨壤Avicennia marina林内的空间分布情况,2008年8月在广西北海市北背岭红树林育苗站的成年白骨壤林中进行了调查研究,应用扩散系数(C)、平均拥挤度(m*)等6种聚集度指标分析小袋蛾空间分布型,结果表明该虫在白骨壤林中的分布型为聚集分布,并利用聚集参数λ分析了该虫聚集原因是其本身的习性和环境因素中任何一个,或者二者共同作用引起的。在此基础上,建立了该虫林间理论抽样数公式,同时给出了不同虫口密度及其不同误差要求的最适抽样数。 Acanthopsyche suberalbata Hampson is one of main pests damaging mangrove. A aggregation indices such as diffusion coefficient(C) ,mean crowding (m^*) were used to analyze the spatial distribution of Acanthopsyche suberalbata in Beibeiling Mangrove Seedling Station in August,2008. The resuits showed that the spatial distribution pattern was assembly distribution. The aggregation was caused by either one of its behavior and environment or the both. Based on this distribution pattern, the model was proposed. Meanwhile, the optimum theoretical sampling numbers according to diffrent population densities and errores were give.